I was thinking about sword smithing and i have a few questions on it + some other questions. First being where can i apprentice or learn to make a folded steel katana or any sword for that matter. In phoenix, arizona does anyone know of any schools that teach a particular sword art? Does anyone have an opinion on wich sword art is the best to use? any help appreciated

Your best bet would be to find a bladesmith who will take you on as an apprentice, but it will not be quick. A traditional Japanese apprenticeship takes four years, and others take even longer; I know of some twelve years long.